Kemba Walker -- Get Drafted, Get ASSted

6/25/2011 2:20 AM PDT BY TMZ STAFF

Kemba Walker had only been drafted into the NBA for just a few hours when he took part in a very important initiation ritual -- letting a random club hoochie grind her ass in his crotch.

Kemba -- along with fellow draftees Marcus and Markieff Morris, and Milwaukee Bucks star Brandon Jennings -- hit up Greenhouse in New York City on Thursday night, where Cardiac Kemba enjoyed the affections of the lovely blonde while drinking massive bottles of champagne, and someone -- didn't appear to be Kemba -- made it rain.